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56 = 2(x+6) + 2(2x-8)
56 = 2x + 12 + 4x - 16
60 = 6x
x = 10
p = x + 6 = 10 + 6 = 16 cm
l = 2x - 8 = 20 - 8 = 12 cm
t = 3x - 6 = 30 - 6 = 24 cm